Re: Re: [PATCH] RISC-V: Use VLS modes if the NITERS is known and smaller than VLS mode elements.

Thanks Robin. Committed. juzhe.zh...@rivai.ai From: Robin Dapp Date: 2023-10-16 17:12 To: Juzhe-Zhong; gcc-patches CC: rdapp.gcc; kito.cheng; kito.cheng; jeffreyalaw Subject: Re: [PATCH] RISC-V: Use VLS modes if the NITERS is known and smaller than VLS mode elements. Hi Juzhe, this LGTM.

Re: [PATCH] RISC-V: Use VLS modes if the NITERS is known and smaller than VLS mode elements.

Hi Juzhe, this LGTM. I was first concerned whether we would want to stop e.g. at LMUL = 1 and only continue with a specific flag but actually this should be done via the costs. If an implementation wants to penalize or incentivize some behavior it can always adjust the costs which should be

[PATCH] RISC-V: Use VLS modes if the NITERS is known and smaller than VLS mode elements.

void foo8 (int64_t *restrict a) { for (int i = 0; i < 16; ++i) a[i] = a[i]-16; } We use VLS modes instead of VLA modes even it is specified by dynamic LMUL. gcc/ChangeLog: * config/riscv/riscv-vector-costs.cc (costs::preferred_new_lmul_p): Use VLS modes. gcc/testsuite/ChangeLog: